Drain trap for horizontal drain pipe

ABSTRACT

A floor drain trap for use with a horizontal drain pipe is formed of a housing with a laterally extending connection having an outlet for attachment to the horizontal drain pipe. Extending downwardly into the housing from its upper end and spaced inwardly from its inner surface, is a frustoconically shaped inlet drain pipe section which has its lower end spaced above the bottom of the housing. The housing has an opening communicating with the drain pipe connection and the lower edge of the opening is spaced above both the lower end of the inlet drain pipe section and the invert of the outlet to which the horizontal drain pipe is connected. Flow passes downwardly into the trap through the drain pipe section then upwardly about the outer surface of the inlet drain pipe section and over the lower edge of the opening in the housing into the connection to the horizontal drain pipe.

nited States Patent ifiojima DRAIN TRAP FOR HORIZONTAL DRAIN PIPE Attorney-McGlew and Toren [5 7] ABSTRACT A floor drain trap for use with a horizontal drain pipe is formed of a housing with a laterally extending connection having an outlet for attachment to the horizontal drain pipe. Extending downwardly into the housing from its upper end and spaced inwardly from its inner surface, is a frustoconicaily shaped inlet drain pipe section which has its lower end spaced above the bottom of the housing. The housing has an opening communicating with the drain pipe connection and the lower edge of the opening is spaced above both the lower end of the inlet drain pipe section and the invert of the outlet to which the horizontal drain pipe is connected. Flow passes downwardly into the trap through the drain pipe section then upwardly about the outer surface of the inlet drain pipe section and over the lower edge of the opening in the housing into the connection to the horizontal drain pipe.

10 Claims, 3 Drawing Figures [72] inventor: Noriatsu Kojima, Yanagishima-cho 5,

chome 31, Nagoya, Japan [22] Filed: Nov. 10,1970

[21] Appl.No.: 88,442

[30] Foreign Application Priority Data Nov. 19,1969 Japan ..44/109l87 ['52] U.S.Cl ..l37/247.35,l37/247.39,4/206 [51] lnt.Cl. ..Fl6k9/00 [58] FieldotSearch ..i37/247.35,247.39;4/l96, 4/206 [56] References Cited UNITED STATES PATENTS 2,087,705 7/1937 Seitz ..137/247.35 2,136,945 11/1938 Klein ..i37/247.35

PATENTEDmm I972 INVENTOR Mae/A Tsz/ A oul /l ATTORNEYS DRAIN TRAP F OR HORIZONTAL DRAIN PIPE SUMMARY OF THE INVENTION The present invention is directed to a floor drain trap for use with a horizontal drain pipe and, more particularly, it is concerned with an overflow arrangement for the passage of flow through the trap into the horizontal drain pipe.

In the past when floor drain traps for connection to horizontal drain pipes have been used in unit type constructions or when the conditions for installation were restricted, they have been found to be impractical because overflow type traps do not function satisfactorly unless the inlet drain pipe diameters were kept small relative to the horizontal drain pipes. In conventional floor drain traps connected to horizontal drain pipes, the drain seal has been imperfect and the size of the inlet pipe connection in the trap had to be smaller than the effective diameter of the horizontal drain pipe and, accordingly, it was not possible to obtain a smooth flow through the tap.

Therefore, the primary object of the present invention is to eliminate the disadvantages experienced in the past and to provide a floor drain trap construction which is simple in its arrangement and assures smooth flow into the horizontal drain pipe.

Accordingly, based on the present invention, a floor drain trap is provided with a housing containing a frustoconically shaped inlet drain pipe section which conveys flow downwardly into the lower part of the housing. Extending from one side of the housing is a horizontally extending drain pipe connection having an outlet into which the horizontal drain pipe is secured. The housing has an opening connecting its interior with the drain pipe connection and the lower edge of the opening is located above the lower end ofthe inlet drain pipe section and also above the invert at the outlet from the drain pipe connection. While the opening into the drain pipe connection has a height less than the height of the drain pipe connection its width is greater than the width of a drain pipe connection thereby affording an increased flow from the housing into the drain pipe connection. Flow into the trap passes downwardly through the inlet drain pipe section then upwardly about the exterior of the drain pipe section through the opening in the housing into the drain pipe connection. Due to the arrangement of the floor drain trap, it is possible to provide a perfect water seal between the trap and the drain pipe and also to assure a stable and smooth flow into the drain pipe connection and the drain pipe itself without requiring any appreciable reduction between the effective size of the horizontal drain pipe and the inlet drain pipe section.

The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its use, reference should be had to the accompanying drawings and descriptive matter in which there is illustrated and described a preferred embodiment of the invention.

BRIEF DESCRIPTION OF THE DRAWING In the Drawing:

FIG. I is a plan view with a portion cut away and shown in section illustrating a floor drain trap in accordance with the present invention;

FIG. 2 is a vertical sectional view of the floor drain trap shown in FIG. I; and

FIG. 3 is a side view, partly in section, of the floor drain trap of FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION In the drawing a floor drain trap is shown formed of a upwardly extending housing having an open upper end 10, a closed lower end lb and a lateral wall extending between the upper end 1a and the lower end lb. Attached to and extending horizontally outwardly from one side of the lateral wall 1c of the housing 1 is a drain pipe connection 3 having an outlet 2 into which a horizontal drain pipe is secured, as shown in chain lines in FIG. 2.

The portion of the lateral wall 10 of the housing 1 which separates the interior of the housing from the drain pipe connection 3 is a partition wall 4 having its upper edge 4' located approximately midway between the invert and crown of the outlet 2 from the drain pipe connection. The upper edge 4 of the partition wall 4 forms the lower edge of an opening 4a communicating between the housing and the drain pipe connection. As can be noted in FIG. 3, the opening 4:: has a greater width than the diametrical dimension of the outlet 2 and its sides and upper edge provide a rectangularly shaped opening. Further, as shown in FIG. 3, a pair of C-shaped channels 5 extend from the partition wall 4 into the drain pipe connection and the lower surface 4" of each groove is an extension of the upper edge of the partition wall 4. Below the lower surface 4 of the grooves 5 the drain pipe connection has a semicircular configuration and its invert slopes downwardly toward the outlet 2.

In the upper end la of the housing I, an annular support frame 6 is provided having an inwardly directed flange 7 located adjacent its lower end. An inlet drain pipe section 8 has an outwardly directed flange 9 located at its upper end which is supported on the flange 7 of the frame 6 and the inlet drain pipe section extends downwardly into the housing and its lower end 10 is located above the lower end lb of the housing 1. The inlet drain pipe section has a frustoconical configuration with its walls converging inwardly as it extends downwardly into the housing. As shown in FIG. 2, the outer surface of the drain pipe section 8 is spaced inwardly from the inner surface of the housing providing an annular flow passage lla which communicates with the space within the drain pipe section through the space 11 within the housing between the lower end 10 of the drain pipe section 8 and the interior surface of the lower end lb of the housing.

Supported within the frame 6 on the flange 9 at the upper end of the drain pipe section 8 is a cover plate 12 having an inlet opening 12a for admitting flow into the drain pipe section 8 of the trap.

When in use, water flows into the trap through the inlet opening 12a and flows downwardly through the inlet drain pipe section 8 into the space 11 at the lower end of the housing 1. As the flow into the trap accumulates, the level of the water starts to rise both within the drain pipe section 8 and in the annular space 110 about its outer surface. Because of the frustoconical shape of the drain pipe section 8, the horizontal cross section of the annular space 11a decreases in the upward direction from the lower end 10 of the drain pipe section. Accordingly, the level rises more quickly as its height above the bottom of the housing increases. When the flow reaches the lower edge 4' of the opening 4a the water overflows the partition wall 4 through the substantially rectangularly shaped opening 40 and flows along the surface 4 of the grooves 5 and the outer face of the partition wall 4 into the drain pipe connection 3. Due to the increased width of the opening 4a and the configuration of the surfaces which convey the water into the drain pipe connection 3 a smooth overflow drain is achieved and abrupt variations in the water level are eliminated. Further, due to the relative elevational positions of the lower end 10 of the drain pipe section 8 below the invert of the outlet 2 and the lower edge 4' of the opening 4a located a significant distance above the invert of the outlet 2, a perfect water seal is obtained.

Due to the construction of the trap, in accordance with the present invention, comparatively large sized horizontal drain pipes can be utilized with the trap without requiring any reduction in the drain pipe size. Further, the trap affords a satisfactory water seal regardless of the low height of the trap and, further, a smooth overflow passage of water through the trap is assured making its use particularly adaptable in a floor of a required height in unit-type construction. Moreover, the side grooves 5 which extend laterally beyond the sides of the horizontal drain pipe and extend inwardly into the drain pipe connection provide an overflow bed not only at the upper edge of the partition wall 4 but also in the longitudinal direction of the drain pipe connection 3 so that a smooth flow is achieved. Additionally, because of the effective water seal provided, due to the arrangement of the drain pipe section 8 and the partition wall 4, odors from the horizontal drain pipe connected to the outlet 2 are satisfactorily eliminated.

What is claimed is:

l. A floor drain trap comprising a trap housing having an upper end, a lower end and a lateral wall extending between its upper and lower ends, a horizontally extending drain pipe connection being attached to the lateral wall of said housing and extending outwardly therefrom and forming an outlet for connecting said trap to a horizontally extending drain pipe, said drain pipe connection forming a passageway between said trap and its outlet, the upper end of said housing having an inlet opening, an inlet drain pipe section extending downwardly within said housing from said inlet opening to a location spaced above the lower end of said housing, said lateral wall comprising an upright partition wall being disposed at the location of the attachment of said drain pipe connection to said housing and extending upwardly from the lower end of said housing to an upper edge located intermediate the invert and crown of the outlet from said drain pipe connection, said upper edge of said partition wall located above the lower end of said inlet drain pipe section, said lateral wall forming an opening between the interior of said housing and said drain pipe connection and being defined along its lower side by the upper edge of said partition wall and the upper edge of said partition wall having a width greater than the width of said outlet from said drain pipe connection.

2. A floor drain trap, as set forth in claim 1, wherein the invert of said outlet from said drain pipe connection being located above the interior lower end ofsaid housing.

3. A floor drain trap, as set forth in claim 1, wherein said inlet drain pipe section having a frusto-conical shape with its walls converging inwardly in the downward direction.

4. A floor drain trap, as set forth in claim 2, wherein the lower end of said inlet drain pipe section being located below the invert of said outlet from said drain pipe connection.

5. A floor drain trap, as set forth in claim 4, wherein said inlet drain pipe section being spaced inwardly from the inner surface of said housing and forming an annular flow passage about said inlet drain pipe section from the lower end of said inlet drain pipe section to the opening into said drain pipe connection.

6. A floor drain trap, as set forth in claim 5, wherein the horizontal cross sectional area of said annular flow passage decreasing in the upward direction from the lower end of said inlet drain pipe section.

7. A floor drain trap, as set forth in claim 1, wherein said opening in said lateral wall having a substantially rectangular shape and each upwardly extending side thereof being spaced laterally outwardly from the inner surface of said outlet from said drain pipe connection.

8. A floor drain trap, as set forth in claim 7, wherein a C- shaped groove being formed in the sides of said drain pipe connection extending from the opening in said lateral wall of said housing toward said outlet from said drain pipe connection, and the lower surface of said C-shaped grooves forming an extension of the upper edge of said partition wall.

9. A floor drain trap, as set forth in claim 8, wherein said drain pipe connection disposed below the lower surfaces of said C-shaped grooves having a semi-circular transverse configuration extending between said partition wall and said outlet from said drain pipe connection.

10. A floor drain trap, as set forth in claim 1, wherein said housing having an inwardly directed flange at its upper end, and said inlet drain pipe section having an annularly shaped outwardly directed flange at its upper end being supported on said flange on said housing. 

1. A floor drain trap comprising a trap housing having an upper end, a lower end and a lateral wall extending between its upper and lower ends, a horizontally extending drain pipe connection being attached to the lateral wall of said housing and extending outwardly therefrom and forming an outlet for connecting said trap to a horizontally extending drain pipe, said drain pipe connection forming a passageway between said trap and its outlet, the upper end of said housing having an inlet opening, an inlet drain pipe section extending downwardly within said housing from said inlet opening to a location spaced above the lower end of said housing, said lateral wall comprising an upright partition wall being disposed at the location of the attachment of said drain pipe connection to said housing and extending upwardly from the lower end of said housing to an upper edge located intermediate the invert and crown of the outlet from said drain pipe connection, said upper edge of said partition wall located above the lower end of said inlet drain pipe section, said lateral wall forming an opening between the interior of said housing and said drain pipe connection and being defined along its lower side by the upper edge of said partition wall and the upper edge of said partition wall having a width greater than the width of said outlet from said drain pipe connection.
 2. A floor drain trap, as set forth in claim 1, wherein the invert of said outlet from said drain pipe connection being located above the interior lower end of said housing.
 3. A floor drain trap, as set forth in claim 1, wherein said inlet drain pipe section having a frusto-conical shape with its walls converging inwardly in the downward direction.
 4. A floor drain trap, as set forth in claim 2, wherein the lower end of said inlet drain pipe section being located belOw the invert of said outlet from said drain pipe connection.
 5. A floor drain trap, as set forth in claim 4, wherein said inlet drain pipe section being spaced inwardly from the inner surface of said housing and forming an annular flow passage about said inlet drain pipe section from the lower end of said inlet drain pipe section to the opening into said drain pipe connection.
 6. A floor drain trap, as set forth in claim 5, wherein the horizontal cross sectional area of said annular flow passage decreasing in the upward direction from the lower end of said inlet drain pipe section.
 7. A floor drain trap, as set forth in claim 1, wherein said opening in said lateral wall having a substantially rectangular shape and each upwardly extending side thereof being spaced laterally outwardly from the inner surface of said outlet from said drain pipe connection.
 8. A floor drain trap, as set forth in claim 7, wherein a C-shaped groove being formed in the sides of said drain pipe connection extending from the opening in said lateral wall of said housing toward said outlet from said drain pipe connection, and the lower surface of said C-shaped grooves forming an extension of the upper edge of said partition wall.
 9. A floor drain trap, as set forth in claim 8, wherein said drain pipe connection disposed below the lower surfaces of said C-shaped grooves having a semi-circular transverse configuration extending between said partition wall and said outlet from said drain pipe connection.
 10. A floor drain trap, as set forth in claim 1, wherein said housing having an inwardly directed flange at its upper end, and said inlet drain pipe section having an annularly shaped outwardly directed flange at its upper end being supported on said flange on said housing. 